During the recent renovation of the Bernard Family Hall of North American Mammals, all light fixtures were replaced with more energy-efficient alternatives. But the five lights above the wolf diorama created new challenges for the team working to restore it. How did the team re-create the illusion of blue moonlight raking over the snowy landscape? In the video, Museum artist Stephen C. Quinn explains the process.

For more images of the hall’s celebrated dioramas, behind-the-scenes videos, archival photos, and more, download the official app, for iOS or Android.